Struct HostFnSpec 

pub struct HostFnSpec {
    pub nomi_name: String,
    pub import_module: String,
    pub import_name: String,
    pub params: Vec<WasmType>,
    pub result: Option<WasmType>,
}

Description of a single host fn the caller wants nomiscript code to be able to invoke.

result: Option<WasmType> is the single source of truth for the wasm import signature. The compiler reads it via CompileContext::host_import_return_type and declares the import using the abstract heap type ((ref null struct) / (ref null array)) that matches wasmtime’s Rooted<StructRef> / Rooted<ArrayRef> WasmTy::valtype(); a ref.cast after every call recovers the concrete type. No per-shape flags, no synthesized guest-side wrap helpers — host returns the GC ref directly.

Fields

nomi_name: String

Symbol the lisp source uses, e.g. rpc-protocol-version. Stored uppercase to match the reader’s symbol-normalisation behaviour.

import_module: String

Wasm import module — typically "nomi" for the rpc-eval channel.

import_name: String

Wasm import function name — typically the snake_case rpc fn name.

params: Vec<WasmType>

Parameter wasm types (in declaration order).

result: Option<WasmType>

Return type, None for () -> () host fns.

Implementations

impl HostFnSpec

pub fn new( nomi_name: impl Into<String>, import_module: impl Into<String>, import_name: impl Into<String>, ) -> Self

pub fn returns(self, ty: WasmType) -> Self

pub fn with_params(self, params: Vec<WasmType>) -> Self

Trait Implementations

impl Clone for HostFnSpec

fn clone(&self) -> HostFnSpec

Returns a duplicate of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Debug for HostFnSpec

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.